Parallelizing multiple precision Taylor series method for integrating the Lorenz system

A hybrid MPI+OpenMP strategy for parallelizing multiple precision Taylor series method is proposed, realized and tested. To parallelize the algorithm we combine MPI and OpenMP parallel technologies together with GMP library (GNU miltiple precision libary) and the tiny MPIGMP library. The details of the parallelization are explained on the paradigmatic model of the Lorenz system. We succeed to obtain a correct reference solution in the rather long time interval - [0,7000]. The solution is verified by comparing the results for 2700-th order Taylor series method and precision of ~ 3374 decimal digits, and those with 2800-th order and precision of ~ 3510 decimal digits. With 192 CPU cores in Nestum cluster, Sofia, Bulgaria, the 2800-th order computation was ~ 145 hours with speedup ~ 105.Comment: arXiv admin note: text overlap with arXiv:1908.0930

One- and two-photon resonant spectroscopy of hydrogen and anti-hydrogen atoms in external electric fields

The resonant spectra of hydrogen and anti-hydrogen atoms in the presence of an external electric field are compared theoretically. It is shown that nonresonant corrections to the transition frequency contain terms linear in the electric field. The existence of these terms does not violate space and time parity and leads to a difference in the resonant spectroscopic measurements for hydrogen and anti-hydrogen atoms in an external electric field. The one-photon 1s-2p and the two-photon 1s-2s resonances are investigated

Experimental Study on Performance Enhancement of a Photovoltaic Module Incorporated with CPU Heat Pipe—A 5E Analysis

As is already known, solar photovoltaic (PV) technology is a widely accepted technology for power generation worldwide. However, it is scientifically proven that its power output decreases with an increase in the temperature of the PV module. Such an important issue is controlled by adopting a number of cooling mechanisms for the PV module. The present experimental study assesses the effect of a fanless CPU heat pipe on the performance of a PV module. The experiment was conducted in June in real weather conditions in Yekaterinburg, Russian Federation. The comparative analysis of two PV panels (i.e., cooled, and uncooled) based on the electrical energy, exergy performance, economic, embodied energy and energy payback (5E) for the two systems is presented and discussed. The key results from the study are that the average temperature reduction from the cooling process is 6.72 °C. The average power for the cooled panel is 11.39 W against 9.73 W for the uncooled PV panel; this represents an increase of 1.66 W for the cooled module. Moreover, the average improvements in the electrical efficiency, and embodied energy recorded for a cooled PV panel 2.98%, and 438.52 kWh, respectively. Furthermore, the calculations of the levelized cost of energy (LCE) for the cooled PV panel indicate that it can range from 0.277–0.964 USD/kWh, while that for the uncooled PV panel also ranges from 0.205–0.698 USD/kWh based on the number of days of operation of the plant. © 2022 by the authors.Y848041; National Natural Science Foundation of China, NSFC: 41761144079, 42150410393; Chinese Academy of Sciences, CAS: 2021PC0002, XDA20060303; Ministry of Education and Science of the Russian Federation, Minobrnauka: FEUZ-2022-0031; K. C. Wong Education Foundation: GJTD-2020-14This research was funded by the Strategic Priority Research Program of the Chinese Academy of Sciences, the Pan-Third Pole Environment Study for a Green Silk Road (Grant No. XDA20060303), the Research Fund for International Scientists of the National Natural Science Foundation of China (Grant No. 42150410393), the International Cooperation Project of the National Natural Science Foundation of China (Grant No. 41761144079), the CAS PIFI Fellowship (Grant No. 2021PC0002), the K.C. Wong Education Foundation (Grant No. GJTD-2020-14), and the Xinjiang Tianchi Hundred Talents Program (Grant No. Y848041).The research funding from the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program) is gratefully acknowledged: Grant number: FEUZ-2022-0031

Опыт применения нусинерсена в качестве патогенетической терапии у взрослых пациентов со спинальной мышечной атрофией 5q в Республике Башкортостан

Background. Spinal muscular atrophy (SMA) affects 1 in 11,000 people. Until 2016, this was considered an incurable disease, but after the approval of nusinersen, the situation has changed. The efficacy of nusinersen therapy is also known in adult patients, although research is limited due to the majority of studies in infants and children. Nusinersen has been included in the list of “Vital and Essential Medicines” since 2021.Aim. To analyze the experience of using nusinersen as a pathogenetic therapy for patients over 18 years of age with SMA 5q in the Republic of Bashkortostan.Materials and methods. We examined eight patients receiving pathogenetic therapy with nusinersen (SMA type 2 – 34.5 %, SMA type 3 – 65.5 %). The Hammersmith Functional Motor Scale Expanded (HFMSE) and the Revised Upper Limb Module (RULM) were used for evaluating the effectiveness of therapy.Results. The median increase on the HFMSE scale was +2 points (7.5, with the initial 5.5) and on the RULM scale – +4.5 points (17 points, with the initial 12.5). Clinically, this was expressed in an increase in muscle strength, an increase in daily activity; a decrease in bulbar, respiratory and vegetative disorders can also be noted. Subjectively, positive dynamics was noted in the increase in working capacity, improvement of the emotional background.Conclusion. The use of the drug nusinersen in adult patients with SMA 5q in some cases provides clinical improvement. The presence of an “overall response” is defined as clinically significant change in one assessed measure of motor function. Введение. Спинальной мышечной атрофией (СМА) болеет 1 из 13 тыс. человек. До 2016 г. она считалась неизлечимым заболеванием, но после одобрения препарата нусинерсен ситуация изменилась. Эффективность терапии нусинерсеном известна как у взрослых пациентов, так и у детей. С 2021 г. нусинерсен включен в Перечень жизненно необходимых и важнейших лекарственных препаратов для медицинского применения.Цель исследования – проанализировать опыт применения препарата нусинерсен в качестве патогенетической терапии у пациентов старше 18 лет со СМА 5q в Республике Башкортостан.Материалы и методы. Нами были обследованы 8 пациентов, получающих патогенетическую терапию нусинерсеном (СМА 2-го типа – 34,5 %, СМА 3-го типа – 65,5 %). Для оценки эффективности терапии использовались Расширенная шкала оценки моторных функций больницы Хаммерсмит (Hammersmith Functional Motor Scale Expanded, HFMSE) и Пересмотренный модуль оценки моторной функции верхних конечностей (Revised Upper Limb Module, RULM).Результаты. Среднее количество инъекций – 7,25. Возрастание медианы по шкале HFMSE составило +2 балла (7,5; при исходной 5,5 балла), а по шкале RULM – +4,5 балла (17; при исходной 12,5 балла). Клинически это выражалось в увеличении мышечной силы, повышении повседневной активности пациентов; также можно отметить уменьшение бульбарных, дыхательных и вегетативных нарушений. Субъективно положительная динамика выражалась в увеличении работоспособности, улучшении эмоционального фона.Выводы. Применение препарата нусинерсен у взрослых пациентов со СМА 5q в ряде случаев обеспечивает клиническое улучшение. Наличие «ответа в целом» определяется как клинически значимое изменение 1 оцениваемого показателя двигательных функций.

Monitoring of the operating parameters of the KATRIN Windowless Gaseous Tritium Source

The KArlsruhe TRItium Neutrino (KATRIN) experiment will measure the absolute mass scale of neutrinos with a sensitivity of mnu = 200 meV/c2 by high-precision spectroscopy close to the tritium beta-decay endpoint at 18.6 keV. Its Windowless Gaseous Tritium Source (WGTS) is a beta-decay source of high intensity (1011 s−1) and stability, where high-purity molecular tritium at 30 K is circulated in a closed loop with a yearly throughput of 10 kg. To limit systematic effects the column density of the source has to be stabilized at the 10−3 level. This requires extensive sensor instrumentation and dedicated control and monitoring systems for parameters such as the beam tube temperature, injection pressure, gas composition and so on. In this paper, we give an overview of these systems including a dedicated laser-Raman system as well as several beta-decay activity monitors. We also report on the results of the WGTS demonstrator and other large-scale test experiments giving proof-of-principle that all parameters relevant to the systematics can be controlled and monitored on the 10−3 level or better. As a result of these works, the WGTS systematics can be controlled within stringent margins, enabling the KATRIN experiment to explore the neutrino mass scale with the design sensitivity

Sorption materials based on waste of wood fiber for collecting of oil from the water surface

Copyright © 2019 American Scientific Publishers. All rights reserved. The paper presents studies of the physicochemical and adsorption properties of magnetic composite materials based on wood fiber wastes produced by MDF panels and magnetite. The process of obtaining composite sorbents consisted in depositing nanoscale magnetite corpuscles on the outer and inner surfaces of wood fibers with ammoniacal water from a solution containing a mixture of bivalent and trivalent ferric chloride. To reduce the degree of water absorption, the obtained materials were subjected to cultivation with a hydrophobizing composition. The physico-chemical characteristics of the samples of the initial and modified materials were indentified. It was found that after the modification observes a significant increase in the buoyancy index associated with the use of a hydrophobic agent is observed, also an increase in ash content conditioned by the presence of magnetite in the composite. The formation in the pores and on the surface of magnetic wood fibers was confirmed by X-ray phase analysis. It was found that the influence of ultrasonic oscillations upon precipitation of magnetite increases by 18% the specific surface area in comparison with the material obtained without applying ultrasound. The influence of the thickness of the oil membrane on the oil capacity and water absorption was studied. For all the materials in question, as the thickness of the oil membrane increases, percentage of water absorbed by the sorbents together with the oil decreases. With an oil membrane thickness of 3 mm, the water absorption for the CS sample is 0.3 g/g, for the CS us sample 0.4 g/g, the oil capacity for CS 6.4 g/g, for CS us 7.1 g/g. To evaluate the sorption properties of the samples, the sorption quality index was calculated. So, the index of sorption quality compared with the oil of the carbon deposit is 0.8 for the original material and 4.6 and 5.0 for the CS and CS us samples, accordingly

Sorption materials based on waste of wood fiber for collecting of oil from the water surface

Copyright © 2019 American Scientific Publishers. All rights reserved. The paper presents studies of the physicochemical and adsorption properties of magnetic composite materials based on wood fiber wastes produced by MDF panels and magnetite. The process of obtaining composite sorbents consisted in depositing nanoscale magnetite corpuscles on the outer and inner surfaces of wood fibers with ammoniacal water from a solution containing a mixture of bivalent and trivalent ferric chloride. To reduce the degree of water absorption, the obtained materials were subjected to cultivation with a hydrophobizing composition. The physico-chemical characteristics of the samples of the initial and modified materials were indentified. It was found that after the modification observes a significant increase in the buoyancy index associated with the use of a hydrophobic agent is observed, also an increase in ash content conditioned by the presence of magnetite in the composite. The formation in the pores and on the surface of magnetic wood fibers was confirmed by X-ray phase analysis. It was found that the influence of ultrasonic oscillations upon precipitation of magnetite increases by 18% the specific surface area in comparison with the material obtained without applying ultrasound. The influence of the thickness of the oil membrane on the oil capacity and water absorption was studied. For all the materials in question, as the thickness of the oil membrane increases, percentage of water absorbed by the sorbents together with the oil decreases. With an oil membrane thickness of 3 mm, the water absorption for the CS sample is 0.3 g/g, for the CS us sample 0.4 g/g, the oil capacity for CS 6.4 g/g, for CS us 7.1 g/g. To evaluate the sorption properties of the samples, the sorption quality index was calculated. So, the index of sorption quality compared with the oil of the carbon deposit is 0.8 for the original material and 4.6 and 5.0 for the CS and CS us samples, accordingly

Magnetic properties of (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1–x</inf> composites

© 2016, Pleiades Publishing, Inc.New composite materials (SrFe12O19)x(CaCu3Ti4O12)1–x (x = 0, 0.05, 1) have been synthesized. Their magnetic properties are studied in the temperature range 5–300 K using the magnetic resonance and magnetometry methods. It is found that strontium hexaferrite microinclusions in the (SrFe12O19)0.05(CaCu3Ti4O12)0.95 composite “magnetize” CaCu3Ti4O12 at temperatures from 300 to 200 K, forming a ferrimagnetic particle near the SrFe12O19 “core.” The magnetic resonance line below 200 K splits into two lines corresponding to SrFe12O19 and CaCu3Ti4O12. The core effect decoration is manifested in the increase in the Curie–Weiss temperature from 25 K in CaCu3Ti4O12 without the doping ceramics to 80 K in the composite with 5% of SrFe12O19

Magnetic properties of (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1–x</inf> composites

© 2016, Pleiades Publishing, Inc.New composite materials (SrFe12O19)x(CaCu3Ti4O12)1–x (x = 0, 0.05, 1) have been synthesized. Their magnetic properties are studied in the temperature range 5–300 K using the magnetic resonance and magnetometry methods. It is found that strontium hexaferrite microinclusions in the (SrFe12O19)0.05(CaCu3Ti4O12)0.95 composite “magnetize” CaCu3Ti4O12 at temperatures from 300 to 200 K, forming a ferrimagnetic particle near the SrFe12O19 “core.” The magnetic resonance line below 200 K splits into two lines corresponding to SrFe12O19 and CaCu3Ti4O12. The core effect decoration is manifested in the increase in the Curie–Weiss temperature from 25 K in CaCu3Ti4O12 without the doping ceramics to 80 K in the composite with 5% of SrFe12O19